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Electrical Machines

Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 1
 2
 4
 8

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Electrical Machines
Rotating part of DC motor is known as

 Pole.
 Starter.
 Carbone brush.
 Armature.

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Electrical Machines
In single phase rotary converter the number of slip rings will be

 four.
 six.
 two.
 three.

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Electrical Machines
Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

 T ∝ √P.
 T2 ∝ P3.
 T is independent of P.
 T ∝ P.

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Electrical Machines
Compensating winding is placed in the

 pole shoe
All of these
 main field
 armature core

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Electrical Machines
No load saturation characteristics are plotted between

 no load voltage and field current
 short circuit current and field current
 no load voltage and armature current
 short circuit current and armature current

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